<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>
    <script src="../react18/react.development.js"></script>
    <script src="../react18/react-dom.development.js"></script>
    <script src="../react18/babel.min.js"></script>
</head>
<body>
    <button id="btn">按钮</button>
    <div id="app"></div>
    <script type="text/babel">
      const oBtn = document.getElementById("btn");

      //创建一个原始虚拟DOM
      const vDom = (
        <div>
          <div>天气预报</div>
          <p>今日小雨</p>
        </div>
      );

      //创建一个根容器
      const root = ReactDOM.createRoot(document.getElementById("app"));
      //把原始的虚拟DOM渲染在根容器中
        oBtn.onclick = function(){
            const vDom = (<div>
                <div>天气预报</div>
                {/* <p>今日小雨</p>*/}
                </div>)
                root.render(vDom);
        }
      root.render(vDom);
    </script>
</body>
</html>